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We report characterization results for an engineering prototype of a next-generation low-frequency radio astronomy array. This prototype, which we refer to as the Aperture Array Verification System 0.5 (AAVS0.5), is a sparse pseudorandom array of 16 log-periodic antennas designed for 70–450 MHz. It is colocated with the Murchison widefield array (MWA) at the Murchison radioastronomy observatory (MRO)...
The Radio Array of Portable Interferometric Detectors (RAPID) is an advanced radio designed for multi-role applications. The system implements a spatially diverse sparse array technology and can be deployed and reconfigured easily. Data are captured at the raw voltage level using the system in the field and processed post-experiment. Signal processing for the system is software defined and uses a...
We present an in-situ antenna characterization method and results for a “low-frequency” radio astronomy engineering prototype array, characterized over the 75–300 MHz frequency range. The presence of multiple cosmic radio sources, particularly the dominant Galactic noise, makes in-situ characterization at these frequencies challenging; however, it will be shown that high quality measurement is possible...
A design of a log-periodic antenna to cover the Medium Frequency Aperture Array (MFAA) band for the Square Kilometre Array (SKA) is described and the simulated results are presented in this paper. In order to obtain a smaller footprint, which will allow specifying the transition between sparse and dense regimes in the array at high frequencies, a smaller version of the initial model has been developed...
This paper describes the important design aspects of an array antenna for the low frequency instrument of the SKA telescope (SKA-low). The most important considerations to meet the telescope performance requirements are discussed. Finally, a plot of the expected sky brightness sensitivity for phase I of the SKA using log-periodic antennas is presented.
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